20212120009997 has 2 divisors, whose sum is σ = 20212120009998. Its totient is φ = 20212120009996.

The previous prime is 20212120009957. The next prime is 20212120010009. The reversal of 20212120009997 is 79990002121202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13132933875721 + 7079186134276 = 3623939^2 + 2660674^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212120009997 - 2⁶ = 20212120009933 is a prime.

It is a super-2 number, since 2×20212120009997² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212120009957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106060004998 + 10106060004999.

It is an arithmetic number, because the mean of its divisors is an integer number (10106060004999).

Almost surely, 2^{20212120009997} is an apocalyptic number.

It is an amenable number.

20212120009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212120009997 is an equidigital number, since it uses as much as digits as its factorization.

20212120009997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 20212120009997 in words is "twenty trillion, two hundred twelve billion, one hundred twenty million, nine thousand, nine hundred ninety-seven".